Can any one advise about what will happen to my existing switch stack when adding an additional slave switch?
I'm trying to confirm whether this will cause a temporary outage to my network or will the master just auto update the new slave?
After doing some additional research and trolling Cisco.com i found that the slave should auto update/download from the master and start working, without causing an outage.
Adding New Members
When the switching stack has established a master, any new switch added afterward automatically becomes a subordinate. All the current routing and addressing information is downloaded into the subordinate so that it can immediately begin transmitting traffic. Its ports become identified with the IP address of the master switch. Global information, such as QoS configuration settings, is downloaded into the new subordinate member.'2'
Note: A new election will only happen if you add a new member that has a higher priority number than the master, to be on the safe side set the priority number to the same value as the last slave.